Phytoplankton Bloom in the Antarctic

Nutrient influxes can cause phytoplankton blooms in the Antarctic.
Seasons in the Ross Sea are marked by ice freezing and melting, and these processes mix the seawater and redistribute salt and nutrients. The influx of nutrients cause phytoplankton to bloom, forming patches of algae in the Ross Sea that are so large that they can be seen by satellite. Here you see polar algae up close, under the lens of a microscope.